// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_

#include "base/macros.h"
#include "base/memory/ref_counted.h"

namespace content {

class WebContents;

// Mutes all audio output from a WebContents.  Internally, this is accomplished
// by providing a MirroringDestination implementation, similar to that found in
// WebContentsAudioInputStream for audio capture/mirroring.  However, the
// WebContentsAudioMuter::MuteDestination only pumps the audio data and discards
// it.
class WebContentsAudioMuter {
public:
    explicit WebContentsAudioMuter(WebContents* web_contents);
    ~WebContentsAudioMuter();

    bool is_muting() const { return is_muting_; }

    void StartMuting();
    void StopMuting();

private:
    // AudioMirroringManager::MirroringDestination implementation which is
    // ref-counted so it remains alive as tasks referencing it are posted on both
    // the UI and IO threads.
    class MuteDestination;
    const scoped_refptr<MuteDestination> destination_;

    bool is_muting_;

    DISALLOW_COPY_AND_ASSIGN(WebContentsAudioMuter);
};

} // namespace content

#endif // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_
